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hey guys, I have a 8v71 engine. Today, it started making a loud knocking sound. Basically, when we start it, after about 3 to 5 seconds of idling, it starts knocking. Here is what we know, the water lines and heater lines are warm (not hot, not cold), and the oil pressure is at about 12lbs. What could this be?

If it was only 12 lbs at 600 rpm which is the idle speed without the fast idle engaged on a cold engine you do have a problem any idea what the engine temp was ? 12 lbs is not bad for a hot engine at idle

If it was only 12 lbs at 600 rpm which is the idle speed without the fast idle engaged on a cold engine you do have a problem any idea what the engine temp was ? 12 lbs is not bad for a hot engine at idle

I'm not sure what is considered a hot or cold engine. We had it running for about 10 minutes and then cut it off, Then we started it again to move it, it was during this time that the sound started.